Projecting abc-lamp



A. D. SIANDEFORD.

PROJECTING ARC LAMP.

APPLICATION FILED FEB. 3. IaIs.

Patented Aug.' 8, 1916.

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A. D. STANDEFORD.

PROJECTING ARC LAMP.

APPLICATION FILED FEB.3.1913.

l 1 93,84 l Patented Aug. 8, 1916.

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66' l /MfG/L) F1' g. ATTORNEY UNITED sTnTEs PATENT OFFICE.

ARCHIE D. STANDEFORD, OF KANSAS CITY, MISSOURI.

rnoJEcriNG Anc-LAMP.

Specification of Letters Patent.

Application led February. 3, 1913. Serial No. 745,907.

.carbon rod clamps, in combination with novel carbonfclamp mountings that permit universal movement of the carbons; means Aconstantly holding said guides in vertical centeredposition, or equidistant above and. below the normal arc position; an improved construction for the movable parts of the lamp frame; an improveddevice for lateral adjustments of the arc; and certain improved details of structure hereinafter pointed out.

Among the advantages which follow the use of said improvements, are: Carbons of any length, however great, may be employed with best results and entailing no additional care by the operator; when the carbons have been initially alined they are held or guided in perfect alinement with their feeding axis or axes, during the full life of the carbone; the carbon rod guides form also optical guides'for the operator, indicating the correct meeting point of the carbons when new carbons are inserted; the height of said guides being unaffected by vertical adjustments of the lamp itself; the insulation of the carbon clamp brackets may be renewed and the parts reassembled without the necessity of alining the upper and lower clamps, which alinement is very difficult and must be performed with the present lamp constructions.

Other advantages will hereinafter ap pear.

' In order that the invention may be fully understood, reference :will now be made to the accompanying drawings, in which:

Figure 1 is a side elevation of a lamp embodying the invention, being arranged for alternating current. Fig. 2 is a top view of the upper carbon clamp and its mounting. Fig. 3 is a front elevation of certain parts of the lamp, the carbon clamps and guides being omitted, and portions of the frame broken away. Fig. 4 is an enlarged vertical section, on line IV-IV of Fig. 1. Fig. 5 is an enlarged detail "section, on a line V-V of Fig. 1. Fig. 6 is an enlarged detail section on a line VI-VI of Fig. 3. Fig. 7 is a sectional detail view of one of the carbon Patented Aug. 8, 1916.`

guides and a piece of carbon therein. Fig. 8

is a top View of the same. Referring to Fig. 1, the lamp base 1 is provided with lugs 2 which support rods 3, on which are slidably mounted the lugs i of the lamp post guide member'5- The latter is provided with a horizontal, front to rearward rack 6 which is engaged by a pinion 7 fixed on a shaft 8, provided with a knob 9, said shaft being journaled in lugs 10 on the base 1.

The member 5 has one integral side wall .12, in which is a chamber 13 to receive a pinion 14 fixed on a shaft 15 having a bearing 16 and extending rearward with a 'knob 17 thereon. At the side opposite said wall 19., two guide plates 18 are secured to the member 5 by screws 19. In the rectangular space within the member 5, the post '20 of rectangular cross-section is vertically slidable. Said post is provided with a rack 21 which meshes with pinion 14. The post and the parts supported thereby remain at any height by friction between the post and its guiding walls. The upper portion 22 of said post is circular in cross-section so as to form a pivot for the swivel block 23 mounted thereon. Said block contains a slot 24. in the upper wall of which is a socket which receives the upper end of the pivot 22. In said slot is arranged ya friction shoe 26, having a concave or groove that embraces half of the pivot Q2, also having a conical indentation adapted to receive the conical end of an elongated stem 27, whose adjacent end is threaded through a boss 28. Said stem is of suitable length and terminates in a knob Q9. It is obvious that when the stem 27 bears upon the shoe 2G the latter grips the pivot Integral with the swivel block 23, or secured thereto, is an inclined back plate 30, best shown in Fig. 6. Said plate is provided with two pairs of lateral lugs 31, 32, eachiA lug of which has two parallel holes there.- through, the holes in the upper lugs being alined with those of the adjacent lower lugs 32. Through the inner holes of each pair 31-32 passes an inclined rod 34, the twoof said rods extending a considerable distance above and below said lugs. Said rods are held from sliding through said lugs, by setscrews 35. Mounted in the outer pairs of holes in said lugs are two shorter rods 36 which extend both above and below the lugs and are secured therein by set-screws 37.

Back plate 3Q-is provided with a shaft bearing 38 'through which extends a shaft 39 having on its outer end a universal joint member 40 and `on its inner end two pinions 41 and 42, of unequal diameters (the ratio beingr about 1 to 2) said pinions being housed in a recess so that the forward pinion is flush with the face of the plate 30.

44 designates a vertical groove at one side of the pinion 41, to receive a downwardly extending rack-bar 45, which raises and lowers the lower carbon holding apparatus, hereinafter described.

46 designates an upwardly extending rack-bar intermeshing with the pinion 42 and adapted to raise and lower an upper carbon holding apparatus, hereinafter described.

When direct current i's employed the upper carbon 62 is consumed more rapidly than the lower carbon, so in order to compensate for this difference' in consumption, the rack-bar 45 is placed in mesh with the small pinion 41, and the rack-bar 46 is placed in mesh with the large pinion 42, so that the latter rack-bar will be driven more rapidly than the former. When alternating current is used the two carbons are consumed at substantially the same rate, and consequently fed at the same rate by transferring the rack-bar 45 into mesh with the opposite side of the pinion 42, engaged by the rackbar 46. The two rack-bars are held in their respective grooves in the back-plate 30 by a removable face-plate 47.

Mounted on the outer rods 36, by lugs 48, 49, is a front plate 50, which is spaced from the cover plate 47 as shown to provide clearance for nuts 51 on bolts 52 which hold the hereafter described carbon guides. Both short rods 36 are slidable through the lugs 48 of plate 50. Said plate 50 is held'at one fixed height at all times by a device shown in Fig. 1 and consisting of a bar or rod 54 having ball-and-socket connections 55 with projections 56, 57 of the plate 50 and the post guide 5, respectively. The function of said plate 50 is to hold the carbon guides 60,

which are set as closely as practicable, above and below the arcing point 61. As shown by Figs. 7 and 8, each of said guides consists of a relatively fixed member 60a and a relatively movable member 611. Member 60 has a V-shaped notch to receive a carbon 62, and has an integral fiat lug 63, also a hinge knuckle 64, through which extends a pivot 65. The companion member 61 is provided with hinge knuckles 66 mounted on pivot 65, and with a stem 67 on which is a small weight 68 which urges the member 61# with suitable pressure against the carbon. By lifting the stem 67, the guide member 61a is moved outward and upward away from the carbon, the advantage of which arrangement is that the carbons may be in'serted and removed from the guides much more easily than by lengthwise movements. The lateral freedom of movement of the carbons is due to the universal carbon clamp mountings, presently described. The lug 63 of each member 60"L is fastened to a shank member 69 by bolts 70, and is insulated from said shank member by a plate 71 of suitable material. Shank member 69 is twisted 90 degrees for a reason apparent from Fig. 1 and has two longitudinal slots 72 through which pass bolts 74 by which the member 69 is secured to one end of a double bracket member 75, which is fastened to front plate 50 by two bolts 52. I provide for simultaneous lateral adjustments of the carbon guides by cutting horizontal slots 76 for the bolts 52. (See Fig. 3). The slots 72 in each member 69, provide for independent forward and backward adjustments of said guides. Vhen direct current is used it is desirable to shift the upper carbon guide 60 rearward a fraction of an inch, before or after making a corresponding adjustment of the upper carbon clamp arm.

yThe upper carbon holding parts are mounted on a plate 77 having four lugs 78, slidably mounted on the guide rods 34. This plate, or slide, is connected with -rack-bar 46 in any suitable manner, as by a pin 79. Cast in the center of slide 77 is a boss 80, inwhich is mounted a horizontal conical-ended Setscrew 81. Cast upon the slide is a yoke 82, which supports a similar set-screw 83, opposed to and alined with set-screw 81. A trunnion 84 is pivotally held between said screws and supports a shank member 85 through which pass two bolts 86 by which an outer shankmember 87 is rigidly secured.

swinging of the upper carbon, While the '130 trunnion 84 permits lateral swinging of the carbon. Thus, the carbon is universally movable when not confined by its guide (30a-61 and when so confined, will evidently offer no lateral resistance to said guide eX- cept the slight inward pressure due to the weight of the carbon.

Forward and backward adjustments of the carbon clamp 62-68 are easily effected by shifting the trunnion set-screws 81, 83, the desired distance.

For connecting one electrical cord terminal to the upper carbon clamp, I have shown in the drawings a lug 92 extended laterally then upwardly from the bottom of the cylindrical body 91, with a binding screw 94 in the outwardly bent portion 95, which I place at such a height that any pull or resistance by the cord will exert a minimum tendency to dislocate the carbon pencil in any direction.

The upper carbon holding apparatus has now been fully described, and as will be apparent from Fig. 1, the lower one is a duplicate thereof, except that the clamp body 96 of the lower device extends up instead of down from its gimbal ring 97, the connect* ing lug 98 being accordingly inverted. The supporting parts are mounted on a slide 99 which is a duplicate of the upper slide 77. The lugs 100 of said slide, embrace the lower ends of guide-rodsI 34.

As the lower rack-bar 45 must be adjustable to mesh with either of the pinions, its connection with slide 99 must be of an adjustable character. As shown in Fig. 3, the adjustment in one direction is provided for 4by slotting the lower end of the rack-bar.

Through the slot passes a pin 101, fixedly mounted in the slide 99 and projecting rearward (see Fig. l) far enough to kee engagement with the rack-bar when the ljatter is engaged with the smaller pinion 41.

The carbons are fed together and oppositely by turning a knob 102,' onv a. stem 103 which is connected by a universal joint 40 43 to the pinion-shaft 39. The arc is ad justed to right or left by operating the stern 27. The entire lamp is raised and lowered by turning the knob 17, and is movable forward and back by turning the knob 9. When the parts 20, 23 are thus raised or lowered, the front plate 50- and the carbon ides will remain stationary, being so held y the parts 54, 56, 57. During the movement of the parts 20, 23, the rods 36, will slide throngh the lugs 48, 49 of the front plate 50. The various other adjustments have been described in detail. When placing a new pair of carbons in the lamp, or readjusting those partly consumed, the operator is to place their meeting ends midway between the guides 60, as shown on Fig. 1. The arc will then be very nearly at the correct height V which is in the optical axis of the lenses (not shown).

While I have `shown and described the preferred form of my invention, Iv reserve the right to make such modifications as properly fall within the spirit and scope of the claims.

Having thus described my invention what I claim and desire to secure by Letters Patent, is:

l. In an arc lamp employing a pair of carbon rods and provided with a suitable frame, a plate mounted on said frame, a pair of superimposed inner shank members secured to said plate, two outer shank members mounted on said inner shank members, carbon guides supported by the outer shank members and permitting the carbon rods to be fed therethrough without movement of said guides, means permitting longitudinal adjustment of said guides, means carried by said plate for guiding carbon rods in a plane parallel to the plane of the plate and including guide plates and a universal joint connecting means between said guide plate and said carbon rods, and means for moving said guide plates. x

2. In an arc lamp'employing carbon rods, a carbon rod holder comprising a slide, a yoke rigidly mounted on the slide, a pair of pivotal set-screws mounted in opposite ends of said yoke, a trunnion pivotally supported by said screws, an extension from said trunnion, a lug secured to and insulated from said extension, a gimbal ring held by said lug, and a carbon rod clamp mounted pivotally in said ring, the pivotal axis of said clamp being at an angle to the pivotal axis of said trunnion.

In testimony whereof I aix my signature in the presence of two witnesses. l

ARCHIE D. STANDEFORD. Witnesses:

L. J. FISCHER, F. G. FISCHER. 

